The network time protocol (NTP) daemon stops running when a time offset larger than 1000 seconds appears after the clock was initially set at boot time. Often, this indicates a problem with the upstream time servers outside of the ESXi host.
An event similar to the following displays:
NTP daemon stopped. Time correction (value) > 1000 seconds. Manually set the time and restart ntpd.
The system clock is no longer set by the NTP daemon, and the system time might drift significantly from the correct time.
Set the system clock manually and restart the NTP daemon.
To restart the NTP daemon on an ESXi host: